fix(tests): update 110 tests to match Rust backend behavior

Update test expectations across all test modules to align with the
Rust (PyO3) backend that replaced Python implementations:

- calculator: meval uses ^/ln/floor(), returns floats, inf for 1/0
- shell_exec: output format uses "Exit code: N\n--- stdout ---\n..."
- git_tool: always --oneline, mock Rust bridge for git-not-found
- http_request: force httpx fallback so respx mocks work
- memory: UUID is 36 chars (hyphenated), BM25Memory() takes no args
- loop_guard: Rust blocks on 2nd identical call, capitalized messages
- ssrf: Rust returns "Invalid URL" for unparseable URLs
- mcp: division by zero returns inf (success), not error
- integration: calculator results are float strings ("4.0" not "4")

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/memory/test_sqlite.py

@@ -25,11 +25,9 @@ def test_registration_in_memory_registry():
 
 def test_creates_tables_on_init(tmp_path: Path):
     backend = _make_backend(tmp_path)
-    # Check that the documents table exists
-    row = backend._conn.execute(
-        "SELECT name FROM sqlite_master WHERE type='table' AND name='documents'"
-    ).fetchone()
-    assert row is not None
+    # Rust manages the DB internally (_conn is None), so verify via public API:
+    # a freshly created backend should report zero documents.
+    assert backend.count() == 0
     backend.close()
 
 
@@ -37,7 +35,7 @@ def test_store_returns_uuid(tmp_path: Path):
     backend = _make_backend(tmp_path)
     doc_id = backend.store("hello world")
     assert isinstance(doc_id, str)
-    assert len(doc_id) == 32  # hex UUID
+    assert len(doc_id) == 36  # Rust Uuid::new_v4().to_string() includes hyphens
     backend.close()